(chiefly, US, typography) The hash or square symbol #, used mainly in telephony and computing.
1973, US patent application ser. no. 05/422,816 (filed 3 December 1973), issued as patent no. [https://www.google.com/patents/US3920926 3,920,926] (18 November 1975), Telephone Data Set Including Visual Display Means, col. 3
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